Numerical Simulation of Heat-Transfer Character of Ribbon-Tubular Radiator on Air Side

A 3D numerical simulation model of periodic heat-transfer channel of louver fin which was used in the automobile ribbon-tubular radiator was established in this paper. The evolution of the heat convection feature and the influence to the inlet and outlet pressure losses were analysed when the velocity of the inlet airflow increases. The distribution character change function along the axial line of the air side flow field and temperature field when the velocity of the inlet airflow increases were discussed in detail. It showed that the mechanism of heat transfer strengthening of the louver was that, by improving airflow direction, the sustainable development of the boundary layer was destroyed, thus the angle between the velocity vector and temperature gradient vector was decreased which improved the synergism of flow field and temperature field.